Exhibition-screen for projecting-machines.



J. F. R. TROEGER.

EXHIBITION SCREEN FOR PROJECTING MACHINES.

APPLICATION FlLED 050.24.1913.

1 ,2 l 6, 380. Patented Feb. 20, 1917.

. 3: ii? ili r glii INVENTOR -WMMW ,4 TTORNEYS JOHN F. ROBERT TROEGER, 0E BROOKLYN .NEW YORK.

EXHIBITION-SCREEN FOR PROJECTING-MACHINES.

Specification of Letters Patent.

Patented Feb. 20, 1917.

Application filed December 24, 1913. Serial No. 808,545.

To all whom it may concern:

Be it known that 1, JOHN F. ROBERT Tnononn, a citizen of the United States, and a resident of New York city, borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Exhibition- Screens for Projecting-Machines, of which the following is a specification.

This invention relates to screens for pr0- jecting machines.

The principal object of the invention is to provide a translucent screen on which the picture may be projected at the rear and viewed by the spectators from the front, the spectators being in the direct path of the light instead of receiving the reflected light from the picture as hitherto.

Another object is to provide a screen of this character through which the light thrown by the projecting machine passes and gives the picture an appearance of unusual sharpness.

A further object is to provide a translucent, flexible screen strengthened with a mesh of material which is itself translucent.

Still another object is to provide a screen of this character with means for protecting the same against stray light while not obstructing the view of the spectators.

Various further objects and advantages will appear hereinafter.

In the accompanying drawing illustratingthe invention,

Figure 1 is a side elevation partly in section illustrating diagrammatically the disposition .of the screen relatively to the pro-' jecting machine and the spectators.

Fig. 2 is a frontelevation of the screen and hood.

Fig. 3 is. an enlarged fragmental view 1 illustrating in perspective the structure of the screen.

Referring to Fig. 1 of the drawing, the improved screen 11 is disposed between the projecting machine 10 and the spectators. The space behind the screen is darkened so as to prevent any light from falling upon the rear of the screen,'except that projected by the projecting machine. The picture from the projecting machine is projected upon the rear face 12 of the screen and the light emanating from the picture passes directly to the spectators.

To secure this result, the screen is made of a translucent, moldable preferably flex ible, material strengthened by a mesh of strands 13, the latter being rendered translucent by any well known method, as by treatment with oil or by the action of the composition forming the body of the screen. The material of the screen preferably comprises a fire-proof mixture of glycerin, gela-' tin and other ingredients specifically de-. scribed and claimed in my co-pending appli: cation Ser. N 0. 808,546, filed Dec. 24th, 1913. I find silken thread answers the purpose of these strands, but any other material having like properties may be used.

The material of the screen possesses a degree of flexibility such that the latter may be conveniently rolled into comparatively small compasseitherfor storage or transportation.

To give the picture an appearance of unusual sharpness and to increase the light diffusing properties of the screen the front face of the screen is formed with vertical corrugations or ridges 14 which, by their refraction of the light, produce the desired effect. \Vhile the molda'ble material of which the screen is composed is translucent,

a certain portion of the light rays may pass through directly, and I find that the vertical corrugations supplement just the required additional light diffusing properties.

To shield the screen from stray light, a frame or hood is formed thereabout consisting of a top portion '15 and side portions 16 projecting forwardly from the screen and overhanging the same. These portions of the frame flare outwardly so as to be clear of the range of vision ofanyof the spectators in the theater. It may be understood, however, that although I prefer to use a frame or hood of this character, the improved screen maybe used without the hood without de artingfrom my invention.

It Wlll thus be clear that I have provided a screen which may be disposed between the projecting machine and the spectators upon which the picture may be projected, so that the rays of light pass from the machine directly t0 the spectators, thus increasing the intensity of the light and making the picture visible by daylight as well as in dark. By reason of the novel formation of the screen, the picture stands out with great sharpness and is much more lifelike than pictures hitherto exhibited. The screen may be protected from extraneous light to further increase the brilliancy and distinctiveness of the projection. By reason, of its flexibility the screen 'may be rolled intocomparatively small compass so as to facili tate storage or transportation thereof.

Having thus described my invention, 1 v claim as new and desire to secure by Letters Patent: l

An exhibition. screen for projecting machines consisting of a sheet of translucent flexiblte moldable non-fibrous fireproof material said sheet having continuousvertical corrugations formed on one face thereof, to supplement the light diliusing' properties of the material. e 2. An exhibition screen for projecting" machines consisting of a body of translucent flexible, moldable non-fibrous fireproof ma terial, .and strands embedded within said lqodyto strengthen the same, said strands being of minute thickness compared with that of the body, said screen being adapted to be rolled into a roll of comparatively small radius for purposes of storage or transportation. I

3. [in exhibition screen for projecting machines consisting of a body oi translucent a are ess flexible, moldable non-fibrous fireproof material having vertical corrugations on the outer surface thereof, and a coarse net-work of fibrous strands embedded within the body to strengthen the same, the thickness of said strands being minute compared with that of the body.

4-.. An exhibition screen for projecting.

machines consisting of a sheet of translucent flexible moldable non-fibrous fireproof material of substantial thickness, there being 

